sr.ht – pronounced “sir hat” – is a new competitor in the world of GitHub, BitBucket, and GitLab. Much like all of these, you can either self-hosted it or use a managed service. It might not yet be as fancy, polished, and cool (I think they need a better name and the domain) as its competitors, but there are a couple of reasons that might make a difference when making a choice:

Open Source. From a quick look, sr.ht is distributed under the GNU Afero GPL.